standard deviation

UB ForumCategory: Statisticsstandard deviation
Chen BoChen Bo Staff asked 6 years ago

Furnace repair bills are normally distributed with a mean of 271 dollars and a standard deviation of 15 dollars. If 36 of these repair bills are randomly selected, find the probability that they have a mean cost between 271 dollars and 273 dollars.

A) 0.2119

B) 0.7881

C) 0.5517

D) 0.2881

1 Answers
Best Answer
Selena TateSelena Tate Staff answered 6 years ago

Furnace repair bills are normally distributed with a mean of 271 dollars and a standard deviation of 15 dollars. If 36 of these repair bills are randomly selected, find the probability that they have a mean cost between 271 dollars and 273 dollars.
Solution: 0.2881